There is only one version of Atom for Windows and it should work fine with any version of Windows version 7 or later, whether 32-bit or 64-bit. If you’re running into problems installing Atom, you should try the troubleshooting steps in the FAQ first:

Temporarily disable any antivirus programs you have running when you attempt to install Atom
If #1 doesn't work and you see the text "PathTooLong" in the output, then you're running into a known Issue that we're tracking. While we work on the longer term solution, there is a workaround.
If neither of the above works, please file an Issue on https://github.com/atom/atom and include in your post the contents of %USERPROFILE%\appdata\local\atom\squirrelsetup.log. If it is too large, you can use h…

I am a hobby programmer (still in early days)
I had a similar problem. Got Windows 64 bit installed on my new computer but somehow many of the Atom add-in packages did not work well as on my old 32 bit machine.
Github is running a version releases site (see link below)
I selected Windows.zip file and installed 32 bit version and all add-ins are running without issues
As long you run underlying programs such as Python etc on 64-bit version you don’t really lose out on performance/speed (tested it on a program to determine Pi until the millionth decimal and recorded timing)